daveeio



; 2 Sheets-Sheet 1'. G. DAVE'RIO. Roller Mill ,for Grinding Grain.

- No. 235,517. Patente d Dec. 14,1880.

Inventor: Gustavllaveria,

N.PETERS, PHOTO-LITHOGRAPHER WASHKNGTON, D c.

' 2Sheets--Shet2.

G. DAVERIO.

' Roller Mill for Grinding Grain. him-235,517. :Patented Dec. 14,1880.

Inveniar:

Gustav llaverio,

day.

N.FETER8. PHOT0-UTHOGRAPHR. WASHINGTON. D. c

" UNITED STATES PATENT OFFICE.

-T all whom it may concern:

GUSTAV DAVEBIO, OF OBERSTRASS, NEAR ZURICH, SWITZERLAND.

ROLLER-MILL FOR GRlNDiNG GRAIN.

, SPECIFICATION forming part of Letters Patent No. 235,517, dated December 14, 1880,

Application filed February 2. 1880. Patented in England October 8, 1877, and June 25, I879.

Beit known that I, GUSTAV DAVERIO, of Oberstrass, near Ziirich, Switzerland, have invented an Improved Crushing or Grinding Mill for Grain and Other Substances; and I do hereby declare that the following description, taken in connection with the accompanying drawings, hereinafter referred to, forms a full and exact specification of the same, wherein I have set forth the nature and-principles of my said improvement, by which my. invention may be distinguished from others of a similar class, together with such parts as I claimv and desire to secure by Letters Patent-that is to say:

My invention relates to the construction of a crushing or grinding mill for which Letters Patent of the United Stateswere granted to me on the 12th of February, 1878, No. 200,263. In such mill three rollers were arranged with their axes in a nearly vertical line, and were surmounted by a feed -hopper with passages therefrom, so arranged that part of the grain or other substance to be operated on passed between the upper and middle rollers and part passed between the middle and lower rollers. The object of this invention is to provide 7 novelimeans of regulating the squeeze of the rolls, to simultaneously adjust the feed at both sides of the mill, and to accurately adjust the feed-openings. independent of each other, all

- as will be fully hereinafter described.

7 On the accompanying drawings, Figure l is a part elevation and part vertical section of my said improved construction of mill. Fig.

2 shows an end elevation. Fig. 3 shows a se.c

tion through the feed-hopper, and Fig. 4 shows a part sectional plan on line at as, Fig. 2.

. A A .A are respectively the upper, middle, and lower grinding-rollers, which maybe either smooth or grooved, the grain or othersubstance being fed. separately between A and A and between A and A from the hopper M, in the manner described in my above-named patent.

Theaxis a of the middle rolleris carried in fixed bearings, and is .driven by a pulley, B,

- and strap or other convenient means, and imparts motion, by toothed gearing O O, to the axesa a 'of the upperand lowerrollers, the

gearing being so proportioned that the speed of the upper and lower rollers is somewhat less than that of the middle one.

The toothed wheels of the upper and lower rollers are, by preference, mortise-wheels.

The axes of the upper and lower rollers are mounted upon the short arms of bent levers D D pivoted at d d to the framing E, and having their long arms extending respectively downward, and upward until they nearly meet at the center line of the middle roller, as shown. On the outer faces of such arms are adj ustingpieces F F, pivoted at ff which pieces have their one end extending to the ends of the lever-arms, and are both simultaneously acted upon by the eccentric G on an axis 'which can be turned by means of a lever, H, working in a quadrant, H. The other ends of the adj usting-pieces F F have screws I passing through them and screwing into the levers D D The long arm of each lever D I) is furthermore connected, by a pin, j, Fig. 4, to a spring-bolt, J, carried by the framing, which tends to draw these arms in the direction of the arrow, and consequently to make the short arms, together with the grinding-rollers A and A to approach the roller A By this spring action the leverarms are brought with their adjusting-pieces F F} against the eccentric G as a stop, and thus it will be seen that, first, by turning the eccentric-stop Gr more or less round by means of the lever H the rollers A A may be moved "nearer to or farther from the roller A and,

.set to their correct position when the eccentric-stop G is in the position shown in the drawings, with its smallest radius presented to the adjusting-pieces, then by turning it round by means of its lever the rollers A A may be quickly moved away from A should any hard substance have passed between either of them, so as to let it pass through, and thus prevent the clogging or injuring of the rollers. On then turning back the eccentric the rollers A A will be at once drawn back into their original position by the spring-bolt J.

It will also be seen that by means of this spring-bolt the rollers A A are held in position with an elastic pressure capable of yield ing somewhat, so as to prevent undue strain on the bearings.

The screws 1 are prevented from shifting after adjustment by means of spring-catches 2' taking into serrated rims on the screws.

The adjusting pieces F F may either be pivoted to the faces of the levers D D as shown, or they may be sunk into recesses in the latter.

The eccentric-stop G is secured in whichever position it is set by means of a thumb-nut, h, holding the lever H in position in the quadrant H.

The thrust of the bearings of the axes a a is taken by anti-friction rollers K K carried in boxes K K, which are hinged to the levers on one side, and are secured thereto by screws on the other side, so that by turning these screws the pressure of the rollers on the bearings can be regulated.

The bearings of a and a are lubricated by small rollers in cups k k below the bearin gs, containing the lubricant, while the bearings of a are lubricated by the anti-friction rollers 0 K themselves, which dip into the lubricant ets on the hopper M.

contained in the box K.

The two feed-apertures m of the feed-hopper M are provided with feed rollers 0, to which a slow rotary motion is imparted in the direction of the arrow, Fig. 3. by means of bevel-pinions L on a shaft, L, carrying a worm-wheel, L in gear with a worm, P, on the axis a of the upper roller.

For regulating the feed-openin gs of the hopper, slides Q carry screw-spindles R, screwing through screwed bushes R, rotatable in brack- These bushes have small bevel-pinions in gear with bevel-piuions S on a spindle, S, passing right through the hopper, and provided with hand-wheels 8, so that by turning the spindle S both slides are simultaneously moved up or down to regulate the feed-openings. For the more accurate adjustment of these openings the slides Q carry plates Q, turning on centers at q and having eccentric slots, through which pass screwed pins on subsidiary slides T, that are secured in the slots by thumb-nuts, so that by adjusting the slotted plates Q the position of the 5 5 slides T can be adjusted accurately upon the slides Q, so as to insure a uniform delivery of the grain along the whole length of the feedopenings.

The devices for delivering the grain or other substance from the feed-openin gs to the grindjug-rollers are the same as described in my former patent, and need not be further referred to.

I do not claim, broadly, two spring-impelled adjustable levers the ends of which serve as bearings for the journals of upper and lower grinding or crushing rollers for adjusting the surfaces of said rollers in relation to each other, as such, broadly, is not new.

Having thus described the nature of my said invention and in what manner the same is to be performed, I claim in respect of three-roller grinding or crushing mills- 1. In a grinding or crushing machine, the combination of the middle roll in fixed bearings, the upper and lower rolls geared with the middle roll, the vertical bell-crank levers pivoted at their angle, the short arms of said levers being provided with bearings, within which the journals of the upper and lower rolls are respectively arranged and supported, the vertical adjusting-pieces F F, connected to and parallel with the outer faces of the long arms of said levers, and an eccentric, G, connected with a lever, H, and acting as a stop to the adjusting pieces and levers, while at the same time serving to actuate them both simultaneously for uniformly adjusting their respective rolls, substantially as and for the purpose described.

2. The combination of the middle roll in fixed bearings, the upper and lower rolls geared with the same, the vertical bell-crank levers D D pivoted at their angle, the short arms of the levers being provided with bearings, within which the journals of the upper and lower rolls are respectively arranged, the vertical adjusting-pieces F F, pivoted near one end to the long arms of the said levers and at their other end connected therewith by the adjusting set-screws I 1 and the eccentric G, connected with a lever, H, and acting as a stop to the adjusting-pieces, while at the same time serving to actuate them simultaneously, substantially as described, for the purposes set forth.

3. The vertical bell-crank levers D D, pivoted at their angle and having their short arms provided with bearings, within which the journals of the upper and lower rolls are respectively arranged and supported in proper position, in combination with an eccentric, G, connected with a lever and acting as a stop to the long arms of the levers, and at the same time serving to actuate them simultaneously for adjusting their respective rollers, and the spring-impelled bolts J, having at their inner the two feed-epenings 0f the hopper, consist- In testimony whereof I have signed my 10 *ing of the slides Q, screw-spindles R, and. name to this specification, in the presence of screwed bushes It, worked from spindle S two subscribing witnesses, this 2d day of Aubytooth-gear, substantially as described. gust, 1879. 5 The device for effecting the independent accurate adjustment of each feed-opening, con- DAVERIO' sisting of the slide Q, eccentric slotted plates Witnesses: i Q, and subsidiary slides T; combined and 0p- CARL RUDoLF MORITZ EBELL,

eratin g substantially as herein described. G. STIERLIN. 

